According to the BBC, phone lines after an explosion or attack of any sort are usually jammed as loved ones try to connect with each other. The app is being marketed as the solution.

There have been two bomb attacks since the app was launched in January, and dozens of the 4,000 people who have downloaded the app so far have used it, tweeting the pre-fabricated message "I am still alive! #Lebanon #Latestbombing."

Some have got in touch with Hassan from outside Lebanon - from Egypt and Pakistan in particular – looking to launch their own localized version, she said. Hassan added that she had been contacted by an NGO interested in using the app in natural disasters.